CBSE Class 7 Mathematics Triangle and its Properties MCQs

Question: Which of the following triangles is possible with the given three sides

a) AB = 20cm, BC = 5cm and AC = 7cm

b) AB = 11cm, BC = 5cm and AC = 6cm

c) AB = 6cm BC = 2cm and AC = 5cm

d) AB = 8cm, BC = 3cm and AC = 4cm

Answer: AB = 20cm, BC = 5cm and AC = 7cm

Question: Which of the following is correct

a) An equiangular triangle is also an equilateral triangle

b) An exterior angle is equal to the sum of any two opposite interior angles

c) The sum of the lengths of any two sides of a triangle is smaller than the length of the third side.

d) A triangle has 5 elements

Answer: An equiangular triangle is also an equilateral triangle

Question: Which of the following triangles is possible with the given interior angles?

a) 46⁰, 84⁰, 50⁰

b) 30⁰, 44⁰, 80⁰

c) 36⁰, 46⁰, 80⁰

Answer: 46⁰, 84⁰, 50⁰

Question: If the angle of a triangle are in the ratio 3:4:5, then the angles of the given triangles are

a) 45⁰, 60⁰, 75⁰

b) 75⁰, 30⁰, 75⁰

c) 55⁰, 50⁰, 75⁰

d) 75⁰, 50⁰, 55⁰

Answer: 45⁰, 60⁰, 75⁰

Question: Which of the following is correct

a) An isosceles triangle can be a right triangle

b) A right triangle cannot be a scalene triangle

c) A right triangle can be an equilateral triangle

d) An obtuse triangle cannot be an isosceles triangle

Answer: An isosceles triangle can be a right triangle

Question: In an equilateral triangle each angle is of

a) 60⁰

b) 90⁰

c) 30⁰

Answer: 60⁰

Question: A triangle has one right angle. What could be the measure of the other two angles?

a) 20⁰ and 70⁰

b) 30⁰ and 70⁰

c) 60⁰ and 20⁰

d) 30⁰ and 15⁰

Answer: 20⁰ and 70⁰

Question: A triangle cannot have more than

a) one right angle

b) two obtuse angle

c) one acute angle

Answer: one right angle

Question: If two acute angles of a right triangle are equal then the two angles are of

a) 45⁰ each

b) 40⁰ each

c) 50⁰ each

Answer: 45⁰ each

Question: If two angles of the triangle are 20⁰, 80⁰, then the third angle is of

a) 80⁰

b) 100⁰

c) 90⁰

Answer: 80⁰

Question: If two angles of the triangle are 43⁰, 65⁰ then the third angle is of

a) 72⁰

b) 82⁰

c) 62⁰

Answer: 72⁰

Question: A scalene triangle cannot be

a) equilateral triangle

b) an obtuse angled triangle

c) an acute angled triangle

d) a right angled triangle

Answer: equilateral triangle

Question: An obtuse angled triangle can be

a) isosceles

b) none of these

c) right angled

d) equilateral

Answer: isosceles

Question: If the sum of two angles is an obtuse angle, then which of the following is not possible?

a) one obtuse angle and one acute angle

b) two right angles

c) one right angle and one acute angle

d) two acute angle

Answer: one obtuse angle and one acute angle

Question: If the sum of two angles is greater than 1800, then which of the following is not possible?

a) tow obtuse angles

b) two right angles

c) one reflex and one acute angle

d) one obtuse and one acute angle

Answer: tow obtuse angles

Question: Which of the following is correct

a) An equiangular triangle is also an equilateral triangle

b) An exterior angle is equal to the sum of any two opposite interior angles.

c) Both

d) None of these

Answer: An equiangular triangle is also an equilateral triangle

Question. How many altitudes can a triangle have ?
(a) one
(b) two
(c) three
(d)four

Question. The exterior angle of a triangle is 120° & one of its interior opposite angles is 70° .Find the measure of its other interior opposite angle ?
(a) 90°
(b) 50° 
(c) 60° 
(d) 100°

Question. The angles of a triangle are in the ratio 2:3:5 . What is the largest angle of the triangle?
(a) 54° 
(b) 36° 
(c) 90° 
(d) 100°

Question. Δ ABC is right-angled at C. If AC = 5cm & BC = 12 cm , what is the length of AB ?
(a) 7cm
(b) 17 cm
(c) 13cm
(d) 20cm

Question. What is the perimeter of the rectangle whose length is 40cm & a diagonal is 41cm?
(a) 164cm
(b) 162 cm
(c) 81cm
(d) 98cm

Question. Among two congruent angles, one has a measure of 70⁰. What is the measure of the other angle?
(a) 140° 
(b) 35° 
(c) 70° 
(d) 110°

Question. Δ ABC ≡ ΔDEF. If AB = 7cm, what is the length of DE ? 
(a) 14cm
(b) 16 cm
(c) 7cm
(d) 18cm